Re: [SoX-users] looking for a really tight (48db) lowpass filter with minimal effect on the remaining stuff

[Fmiser <fm...@gm...>]

> > Fmiser wrote:
> > 
> > The SoX command "lowpass" is a 3 or 6 dB/octave, so that
> > probably isn't abrupt enough for you.

> Jerry wrote:
> 
> Surely you don't mean 3 db/octave.

You are correct. I "slipped" a "digit" - if I had really read
what I wrote I would have spotted it.  Good catch.  

The filters have a Q of 0.707 per pole, so set as a one pole
filter it is 6 dB/octave and as a two pole it is 12 dB/octave.

--   Philip